Make configuration and compatibility contracts executable

designer-standalone/pom.xml

@@ -11,6 +11,13 @@
     <module.java.release>25</module.java.release>
   </properties>
   <dependencies>
+    <dependency>
+      <groupId>de.neitzel.fxdesigner</groupId>
+      <artifactId>designer-core</artifactId>
+      <version>${project.version}</version>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>de.neitzel.fxdesigner</groupId>
       <artifactId>designer-kit-ui</artifactId>

designer-standalone/src/test/java/de/neitzel/fxdesigner/standalone/ConfigurationIntegrationTest.java

@@ -0,0 +1,27 @@
+package de.neitzel.fxdesigner.standalone;
+
+import de.neitzel.fxdesigner.config.*;
+import de.neitzel.fxdesigner.host.*;
+import java.nio.file.*;
+import java.util.*;
+import java.util.concurrent.*;
+import org.junit.jupiter.api.*;
+import org.junit.jupiter.api.io.TempDir;
+
+class ConfigurationIntegrationTest {
+  @TempDir Path root;
+
+  @Test
+  void configurationFailureKeepsRealStandaloneDocumentEditable() throws Exception {
+    var catalog = ConfigurationHostContract.fixture(root);
+    var diagnostics = new ArrayList<HostServices.Diagnostic>();
+    try (var host =
+        new StandaloneHost(
+            new ConfiguredRuntimes(Map.of()),
+            l -> CompletableFuture.completedFuture(null),
+            diagnostics::add)) {
+      ConfigurationHostContract.exercise(host.services(), catalog);
+      Assertions.assertFalse(diagnostics.isEmpty());
+    }
+  }
+}